Double acting automatic draft control device



Jan. 22, M. w. BOWERSOX 1,988,539

DOUBLE ACTING AUTOMATIC DRAFT'CONTROL DEVICE Filed Oct. 28, 1933 2 Sheets-Sheet 1 I nvenlor M. W Bowersox Jan. 22, 1935. M, w BOWERSQX 1,988,539

DOUBLE ACTING AUTOMATIC DRAFT CONTROL DEVICE Filed Oct. 28, 1933 2 Sheets-Sheet 2 Inventor 1. W. .Bowersox This. inve Patented Jan. 22, 1935 w tht a emt i i rl iiwfu m di as aa tis la -i e s i '21s valv a iiei i ee l er;plate.tine A he precedipg statement 'ofa the invention.

mpli s hares olve ni i d ssdav af control unit comprisl ng acasing i attachable ito a flue;p'pe;wherein said-oasing.is equipped with an espemy ebnstruaea"'vaive' arrangement of a counterbalanced type including an .hingedly mounted valve plate -normally positioned in the casing and swingable inwardly to facilitate the introduction of air into the flue, and bodily swingable outwardly beyond the end of the casing to take care of abnormal explosive downdraft,-

whereby to promote uniform operation of the burner so far as the draft supply is concerned.

Needless to say, I am aware of the fact that the prior art to which the invention relates discloses similar double acting valves designed to accomplish somewhat the same fundamental results. My primary aim, therefore, is to generally improve upon these known prior patented structures by providing a different and unique valve assembly and mounting calculated to promote more effective regulation and positive action and to more effectively fulfill the requirement of a structure of this kind.

Other features and advantages of my invention will become more readily apparent from the following description and drawings. Y

In the drawings: n 1 i 1 Figure 1 is an end elevational view of the valve control device showing the valve plate or shutter as closed. I

Figure 2 is a view taken approximately on the plane of the line 22 of Figure 1, with parts shown in phantom style to better portrait and emphasize the principal improvement.

Figure 3 is a perspective view of the valve plate.

Figures 4.5 and 6 are detail perspective views.

Referring firstto Figure2 it willbe observed that the numeral 7 designates a draft pipe the lower end 8 of which is suitably attached to the furnace flue connection (not shown) and the upper end 9 of which is appropriately connected with'the chimney or flue (not shown). The numeral 10 merely designates an attaching nipple to which the improved unit; designated as a whole by the numeral 11 is attached. The unit may be of any appropriate cross-sectional shape but it preferably comprises a sheet metal casing 12 whose inner end 13 is fashioned for connection to the cylindrical nipple 10 and whose outer end ofrijNG' AUTOMATIC DRAFT; QNTRQ DE E 1 I ference toga double acting draft regr "prec st: siiualr or to aojcome i pd ie the ra re' senib r a 1 I ve plat'ejprshutter 14,',t his,be1ng;pivotally.

metal which is hingediyattaehd intermediate'its ends; as indicatedat18 t the lowerportion orb t tom of the casing's'hwn iii Figure? "Theezitrme upper end thereof 19 constitutes a stop and is engageable in the bead 20. The lower or depending 7 end portion 21 has a slidable adjusting weight 22 held in place by a set screw 23. This permits the pendulous-action of the bar to be regulated and controlled according .to predetermined conditions. Thus it will be seen that I provide a pendulouslike bar 17 hingedly attached between its ends as at 18 to the outer end of the casing 12 with its upper end 19 engaging the bead 20 and the lower end 21 depending and carrying an adjustable weight 22, said bar serving to accommodate a hinged bracket 16 on which swingably mounted or pivotally attached a shutter' plate 14 is suspended.

The plate itself is adjustable in action and is, therefore, provided with a 'U-shaped mounting fixture 24 designed toaccommodate a slidable counterweight 25 held in said position by a screw 26. Consequently the two parts 1'7 and 14 are independently adjustable as to sensitivity of action.

Under normal draft conditions the valve unit or assembly occupies the full line position shown in Figure 2. That is, the pendulous arm or bar 1'? is substantially perpendicular with its upper end 19 resting against the stop bead 20. Of course, the position of the valve plate 14 depends on the degree of suction developed in the'flue '7. For example, when the valve plate 14 is closed it occupies the perpendicular position shown in-Figure 1. When the suction is increased in the flue the valve plate 14 swings inwardly to admit air into the fine by way' of the casing 12 and nipple 10. The action of this valve plate can be controlled by regulating the counterweight 25. Under abnormal draft conditions when the down draft becomes expansive in action, the overcharge of pressure is relieved or'exhausted through the able weight 22. Here again it is to be pointed outthat this exhaust relief action can be regulated more or less by the position of the weight 22.

A careful consideration of the foregoing description in conjunction with the illustrative drawings will enable the reader to obtain a clear understanding of the purpose, features and advantages, the explicit construction, and the invention as hereinafter claimed.

It is "to be understood thatminor changes shape,'-size, relativeproportions, and materials may be resorted to in practice without departing from the spirit of the invention or the-scope of the inventionasnow claimed.- 7

Whatis claimed is: 2*

1. A device of the class described comprising a casing attachable to a flue, a 'bar'hingedly attached intermediate itsends to the bottom of said casing, the upper portion ,or said bar span' ning the open outer end of said casing-withits upper extremity engageable withthe .top wall of the casing to limit the swinging movement of the bar one direction, the lower end portion of said bar depending below the casing, a V regulating weight adjustablymounted on saidlower end por'- tion, and avalve plate normally disposed within. the, lim tof; said casin'g and hingedlyattached' at. its upper end 'tofthe corresponding end portion 2 A device"ot the class described comprising a casing attachable to a flue, a bar hingedly attached intermediate its ends to the bottom of said casing, the upper portion of said bar spanning the open outer end of said casing with its upper extremity engageable with the top wall of the casing to limit the swinging movement of the bar in one direction, the lower end portion or said bar depending below the casing, a regulating weight adjustably, mountedyjonfsaid, lower end portion, and a valve plate normally'disposed within the limit of said casing and hingedly attached at its upper end to the corresponding end portion V of said bar, saidvvalve plate corresponding in shape and proportion to'the casing and being provided on its inner side with a guide fixture, and'an adju'sting weight slidable on said guide fixture.

; 3., ,The combination of a pipe having an opening therein, a bar having an intermediate part hingedly connected to the bottom part oi. the pipe adjacent the opening, an adjustable weight on the lower part of the bar, s'aid weightnormally hold-1 ing the bar, across the op'ening withits upper end contacting *an lripperf portion or the pipe, a valve 'rnerr'iliaerqfor clos'in e 'op'ening and havingits top-part hingedly conneet'edto'the upper part of the bar', a weight supported from the valve member for vertical in thewei ih e i s e i e BOWERSOX' temehmnemeans for holding 

